Electric machine.



No. 853,55. PTENTBD MAY 14:,I 1907.

G. BE KANDO.

ELBGTRIU MACHINE. Prummel rum) 11110.18. 190e.

vnr "onus nfnrsno., insmusmu. n. n:4

coLoMAN ne KANno, or scharnier, AUSTRIA-HUNGARY.

ELEGTHC MACHINE.

Specicaton of Letters Patent.

Patented May 14, 1907.

Application Sled December 13, 190B. Serial No. 347,572.

.To all whom t may concern:

Be it known that I, Coronas nr: Kanne, a subject of the King oi' Hungary, and a resident of Fels erdsor 12, Budapest, in the Empire of Austria-Hungary, have invented certain new and useful Improvements in or Relating to Electric Machines; and I hereby declare the followingr to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to electric machines with divided windings arranged in grooves, and more especially to an arrangement to protect the portions of the Winding projecting outward at the ends of the machine, on the one hand, against outside influences of any kind, and on the other hand, against heating produced by short overloads. To that end, the surface of the frame is provided with circular covers which completely inclose the winding portions in question, and which have the sha e of a casing and into which is cast or introdliiced a suitable insulating mass,

the melting point of which is-above the nor-Y mal heating, in such manner thatthe portions of the Winding projecting at the ront ends `oi the iron frame, are completely and lirmly embedded in the solidie mass. .In

this way the winding portions are completelyY n rotected from moisture, excellentlyT insuated and in addition to that, the wires are prevented from rubbing against each other and spoiling the insulation, moreV particulai-ly in the case of railway motors exposed to vibrations acting on the freely suspended portions of the winding. Owing to its high specific heat capacity, the mass exercises a favorable influence on the ceiling, more particularly in the case of strong over-loads of the motor, lasting onl for a short time. When the overload of te machine heats the winding to the point of melting oi' the mass, the absorption of the heat during the melting produces an efficient cooling effect. This arrangement Was found however to have the' serious drawback that when the mass was melted, it passed through the grooves of the iron frame into the air gap between the frame and the armature or rotor and when the mass subsequently cooled, it solidified, and caused the armature or rotor to stick fast.

These drawbacks are obviated according to this invention by the annular casing surrounding the projecting portions of the winding boing provided with means allowing free Vlowest point, the casing;

escape to the mass when melted from the circular casings. For this purpose I provide said circular cssings atvtheir lowest point with suitable openings.

Owing to the coils of the winding being uniformly distributed in the whole melting mass, if the Winding is heated, the mass is melted in a uniform manner, so that a high hydrostatic pressure is forcing out the molten or softened mass through the openings in question. The escaping and solidifying mass forms a strip, so that the heating of the motor is at once recognized by the appearance oi' such a strip.v

Owing to the provision of a free outlet for the molten mass, in passing through which the mass has to overcome a smaller resistance than when penetrating into the slits between the grooves of the frame and the windings placed therein, the molten mass does not penetrate into the frame or stator and does not cause the armature or rotor to stick.

A construction according to this invention is diagrammatically illustrated in the eccompanying drawing which shows a three-phase motor in longitudinal section.

The portions 2 of the Winding, projecting at the two end faces of the frame l, are inclosed in a circular casing constituted by a cover 3 and the sheet metalcylinder 4. Into this casin is cast a solid insulating mass 5 the melting point of which corresponds to the highest admissible temperature. At the is provided with a hole 6 through which t e molten insulating mass 5 can passwhen melted in the shape of a strip or strand, 7.

In order to render the filling up with the molten insulating mass easy, the case 3, can be provided at its highest point With an opening 8 over which can be arranged a funnel or suY ply tank 9. The insulating mass centaine in the tank 9 is melted bv condection when the winding is heated, and is drawn in as the molten mass escapes at the bottom.

Having now described my invention what I claim is l'. in electric machines, with windings arranfred in the grooves of the stator, portions of tllie winding projecting at the faces of the stator, means forming circular casings including said projecting parts of the windings, a solid insulating mass adapted to melt when the winding is heated above the normal point in said circular casing embedding the stator, means forming circular casings inprojecting parts oi the windings, means to prevent said mass when melted from entering the space between the stator and the rotor.

2. ln electric machines, with windings arranged in the grooves of the stator, portions of the winding projecting at the faces of the stator, means` `forming circular casings including said projecting parts oiI the windings, a solid insulating mass adapted to melt when the winding is heated above the normal point in said circular casing embedding the projecting parts of the windings, means allowing lree escape of the mass when melted from said circular casings.

Il. ln electric machines, with windings arranged in the grooves of the stator, portions of the windings projecting at the faces of the stator, means forming circular casings including said projecting parts of the `windings, a solid insulating mass adapted to melt when thc winding is heated above the normal. point in said circular casing embedding the projecting parts oi the windings, suitable opening in said circular casings a lowing ree escape of the mass when melted.

4. n electric machines with windings arranged in the grooves of the stator, port-ions of tile winding projecting at the faces of the cluding said projecting parts of the windings, a solid insulating mass adapted to melt when the winding is heated above the normal point in said circular casing embedding the projecting parts orv the windings, suitable openings at the lowest part of said circular casing allowing free escape of the mass when melted- 5. In electric machines with windings arranged in the grooves of the stator, portions of tie winding projecting at the faces of the stator, means forming circular casinvs includinglr said projecting parts of the windings, a solid insulating mass adapted to melt when the winding is heated above the normal point in said casing eiiil:edding the projecting part-s of the windings, means to prevent said mass when melted from entering the space between the stator and the rotor and means to allow a supply for the insulating mass into said circular casings.

6. In electric machines, with windings arranged in the gwoves of the stator portions oi the winding projecting at the faces of the stator. means forming circular casing including said projecting parts of the windings,

a solid insulating mass adapted to melt when the winding is heated above the normal point. in said cirrulzir casing embeddingr the projecting partso thewindings,nicansa low- :ng lrce escape oi' the mass when melted from said circular casings and incans to allow a supply for the insulating uniss into said circular casings.

Tv ln electric nmcliini-s, with windings nl ranged in the grooves of the stator, portions of the winding projecting at the faces ol the stator, means forming circular casings including said projecting parts of the windings, a solid insulating mass adapted to melt when the winding is heated above the normal point in said circular casing embedding the projecting parts of the windings, suitable openings in said circular casing allowing free escape of the mass when melted and means to allow a supply for the insulating mass into said circular casings.

8. In electric machines with windings arran cd in the grooves of the stator, portions of t ie windin projecting at the faces of the stator, means orming circular casings including said projecting parts of the windings, a so id insulating mass adapted to melt when the windingis lieated above the normal point in said circular casing embeddin the projecting parts of the windings, suitagble openin at the lowest part of said circular casings a lowing freeescape of the mass when melted and means to allow a supply for the insulating mass into Asaid circular casings.

9. In electric machines with' windings arran ed in -the grooves of the stator portions of tie win projecting at the faces of the stator, 'means ol'ming circular casings includsaid'projectingparts of the a sudid insulat mass adapted to melt when the winding is eated above the normal point in said circular casing embedding the projecting parts of the windin means to prevent said mass when melte from -entering 'the space between the stator and the rotor, suitable charging openings in said circular chambers allowing a'supply of the insulating mass.

v10. In electric machines, with windings arranged in' the grooves. of the stator portions of tiewin vprojecting at the faces of the stator, means orming circular casings including said projecting parts of the windings, a solid insulatin mass adapted to melt when the winding is eated above the normal point in said circular casing embedding the projecting parts of the windings, means allowing free escape of the mass when melted from said circular casings, suitable charging openings in said circular chambers allowing a supply o the insulating mass.

11 In electric machines, with windings arran f the winding projecting at the faces of the stator, means forming circular casings including said projectingparts of thewindings, a solid insulating mass adapted to melt when the winding is heated above the normal point in said circular casing embedding the projecting parts of the windings, suitable openings in said circular casin s allowing free escape of the mass when me ted, suitable charging opening in said circular chambers allowing a supply of the insulating mass.

12. In electric machines with windings ar- Ued'in the grooves of the stator portions A ranged in the grooves ol the stator, portions of the winding projecting at the laces ol the stator, means 'lorrainer circular casings including' said projecting;l parts ol the wind ingajs, a solid insulating mass adapted to melt when the winding isheatcd above the normal point in said circular casing einbedding;` the projecting parts ol the windings, suitable openings at the lowest part of said circular casings allowing lrec escape of the mass when melted, suitable charging openings in said circular chambers allowing a supply of the vinsulatingI mass.

13. In electric machines with windings arranged in the grooves ol the stator, portions of the winding projecting at the laces oil the stator, means formingv circular casinos in-Y cluding said projecting parts of the win( ings, a solid insulatingY mass adapted to melt when the winding is heated above the normal pointv in said circular casingi embedding the projectu ing parts el the windings, means to prevent said 'mass`when melted from entering the space between the stator and the rotor, suit able chargingn openings at the highest part ol said circular casings.

14. In electric machines, with windings arranged in the grooves of the stator, portions of the winding projecting at the faces of the stator, means forming circular casings including said projecting parts of the windings, a solid insulating mass adapted to melt when the winding is heated above .the norinal point in said circular casing embedding the projectingr parts ol the windings, means allowing free escape of the mass when inelted from said circular casings, suitable charging openings at the highest part of said circular caslngs.

15. In electric machines, with windings arranged in the grooves of the stator portions ol the winding projecting at the faces of the stator, means forming circular cases including said projecting parts of the windings, a solid insulating mass adapted to melt when the winding; is heated above the normal point in said circular casing embedding the pro jecting parts of the windings, suitable openings in .said circular casings allowing?T free escape ol' the mass when melted, suitable charging openings at the highest part of said circiil ar casings.

16. In electric machines with windings arranged in. the grooves of the stator, portions of the winding,y projecting at the faces of the stator, means forming circular casings includ.- ing said projecting parts of the windings, a solid insulating mass adapted to melt when the winding is heated above the normal point in said circular casing,r embedding the projecting parts of the windings, suitable openings at the lowest part of said circular cas ings allowing free escape of the mass when melted, suitable charging openings at the highest part of said circular casings.

i7. ln electric machines with windings arranged in the grooves of the stator, portions of the winding projectingr at the faces of the stator, means 'forming ('.iic'llar casings incleding` said projectinpr parts ol the windings, a solid insilating in adapted to melt when thel windingr is heated above the normal point in said circnlar casing,r embedding the projecting parte ol the windings, means to prevent said mass when melted from entering the space between the stator and the rotor, snitahle charging openings in said circular chambers allowing a supply of the insulating mass and supply tanks communicating with said charging openings.

i8. In electric machines with windings arranged in the grooves of the stator, portions of the winding projecting at the faces of the stator, means forming circular casings including said projecting parts of the windings, a solid insulating mass adapted to melt when the winding is heated above the normal point .in said circular casing embedding the projec ting parts of the windings, means allowing free escape ci the mass when melted from said circular casings, suitable charging openings in said circular chambers allowing a supply of the insulating mass and suppljT tanks communicating with said charging openings.

i9. In electric machines with windiiiigs arranged in the grooves ot the stator, portions of the winding,r projecting at the faces of the stator, means ,liorgn'iing circular casings including said projecting parts of the windings, a solid insulating mass adapted to melt when the winding is heated above the normal point in said circirlar casingV embedding the projecting parts of the windings, suitable openings in said circular casing allowing free escapeof the mass when melted, suitable charginfr openings in said circular chambers allowinei a suppl y of the inside-timax mass, and supply tanks communicatingr with said charging openings.

20. In electric machines with windings arranged in the grooves of the stator, portions of the winding projecting at the faces of the stator, means forming circular casingsinclud* ing said projecting partsof the windings, a solid insulating mass adapted to melt when the winding is heated above the normal point in said circular casing embedding the projecting arts of the windings, suitable openings at 51e lowest part of said circular casings allowingr free escape of the mass when melted, suitable charging openings" in said circular chambers allowing a supply of the insulating mass and supply tanks communicating with said charging openings.

2l. In electric machines with windings arranged in the grooves ol the stator, portions oi the winding projecting at the faces of the stator,1neans forming circular casings include ing` said projecting parts of the windings, a

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solid insulating mass adapted to melt when the winding is heated above the normal point in said circular casings embedding the pro jecting parts of the windings, means to prevent said mass when melted from entering the space between the stator and the rotor, suitable charging openings at the highest part of said circular casings, and supply tanks communicating with said charging openings.

22. In electric machines, with windings arranged in the grooves of the stator, portions of the winding projecting at the faces of the stator, means forming circular casings including parts of the windings, a solid insulating mass adapted to melt when the winding is heated above the normal point in said circular casing embedding the projecting parts of the windings, means allowing free escape of the mass when melted from said circular casings, suitable charging openings at the highest part of said circular casings and supply tanks communicating with said charglng openings.,

23. In electric machines, with windings arranged in the grooves of the stator, portions of the winding projecting at the Jfaces of the stator, means forming circular cases includ ing said projecting parts of the windings, a solid insulating mass adapted to melt when the winding is heated above the normal point in said circular casings embedding the projecting parts of the windings, suitable openings in said circular casings allowing free escape of the mass when melted, suitable charging openings at the highest part of said circular casings and supply tanks communicating with said charging openings.

24. In electric machines with windings arranged in the grooves of the stator, portions of the winding projecting at the faces of the stator, means forming circular easings including said projecting parts of the windings, a solid insulating mass adapted to melt when the winding is heated above the normal point in said circular casing embedding the projecting parts of the windings, suitable openings at the lowest part of said circular casings allowing free escape of the mass when melted, suitable charging openings at the highest part of said circular casings and supply tanks communicating with said charging openings.

In testimony whereof, I have signed my name to this specification in the presence of two subscribing witnesses.

EUGENE HARsANY, CHARLES E. WYATIM. 

